US4722749A - Pyridinesulfonamides and their use as herbicidal agents - Google Patents

Pyridinesulfonamides and their use as herbicidal agents Download PDF

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US4722749A
US4722749A US06/938,681 US93868186A US4722749A US 4722749 A US4722749 A US 4722749A US 93868186 A US93868186 A US 93868186A US 4722749 A US4722749 A US 4722749A
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sub
compound
chloro
pyridinesulfonamide
methyl
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Shy-Fuh Lee
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Sandoz AG
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/89—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members with hetero atoms directly attached to the ring nitrogen atom
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/34—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings

Definitions

  • This invention relates to substituted 2-pyridinesulfonamide 1-oxides, synthesis thereof, intermediates therefor, and the use of the compounds for the control of weeds.
  • t is zero, one, two, three or four;
  • R 1 is hydrogen, unsubstituted or halogenated C 1-8 alkyl, unsubstituted or halogenated C 2-8 alkenyl, C 2-8 alkynyl, C 2-10 alkoxyalkyl or C 2-10 alkylthioalkyl;
  • R 2 is hydrogen or C 1-8 alkyl
  • W is CH or N
  • W 1 is CH or N; wherein when either of W or W 1 is CH, it can be independently substituted by Y or Z;
  • X is hydrogen, unsubstituted or halogenated C 1-8 alkyl, C 1-8 alkoxy or halogen;
  • Y is unsubstituted or halogenated C 1-8 alkyl, unsubstituted or halogenated C 1-8 alkoxy, C 1-8 alkylthio, C 2-8 alkoxycarbonyl, nitro, cyano or halogen;
  • Z is hydrogen or independently selected from the values of Y.
  • n is preferably zero or one, more preferably zero.
  • t is preferably zero, one, two or three; more preferably zero, one or two; most preferably zero or one.
  • any of the substituents R 1 , R 2 , X, Y or Z is or comprises halogen
  • such halogen is conveniently selected from bromo, chloro and fluoro.
  • R 1 is unsubstituted or halogenated C 1-8 alkyl, such alkyl has preferably 1 to 5, more preferably 1 to 3 C atoms.
  • R 1 is unsubstituted or halogenated C 2-8 alkenyl
  • such alkenyl has e.g. 3 to 5, preferably 3 or 4 C-atoms.
  • R 1 is alkynyl it comprises e.g. 3 to 5, preferably 3 C-atoms.
  • R 1 is halogenated C 1-8 alkyl or C 2-8 alkenyl, it comprises preferably 1 to 3, e.g. 1 or 2 halogen atoms.
  • R 1 is C 2-10 alkoxyalkyl, it is preferably C 1-5 alkoxy-C 1-5 alkyl, e.g. CH 2 OCH 3 .
  • R 1 is C 2-10 alkylthioalkyl, it is preferably C 1-5 alkylthio-C 1-5 alkyl.
  • R 2 is C 1-8 alkyl it has preferably 1 to 5 C-atoms.
  • X is unsubstituted or halogenated C 1-8 alkyl, it comprises preferably 1 to 5, e.g. 1 C-atom.
  • X is halogenated C 1-8 alkyl it comprises preferably from 1 to 3 halogens.
  • An example of a preferred haloalkyl significance of X is CF 3 .
  • X is C 1-8 alkoxy it has preferably from 1 to 5 C-atoms.
  • Y and Z is unsubstituted or halogenated C 1-8 alkyl, it comprises preferably from 1 to 5, more preferably 1 or 2 C-atoms.
  • any of Y and Z is halogenated C 1-8 alkyl, it comprises preferably from 1 to 3 halogens.
  • Y or Z An example of a preferred haloalkyl significance of Y or Z is CF 3 .
  • Y and Z is unsubstituted or halogenated C 1-8 alkoxy it comprises preferably from 1 to 5, particularly 1 or 2 carbon atoms.
  • any of Y and Z is halogenated C 1-8 alkoxy it comprises preferably from 1 to 4 halogen atoms.
  • Y and Z is C 1-8 alkylthio, it comprises preferably from 1 to 5 C-atoms.
  • Y and Z is halogen, it is preferably F or Cl.
  • Y and Z is C 2-8 alkoxycarbonyl, it is preferably (C 1-5 alkoxy)carbonyl.
  • R 1 is preferably C 1-5 alkyl, C 2-5 alkenyl or C 2-5 alkynyl.
  • R 2 is preferably hydrogen.
  • X is preferably hydrogen or halogen.
  • Y is preferably C 1-5 alkyl, CF 3 , nitro or halogen.
  • Z is preferably C 1-5 alkyl, CF 3 , halogen, or di- or trifluorinated C 1-5 alkoxy.
  • At least one of W and W 1 is CH; more preferably W and W 1 are both CH.
  • a preferred sub-group of the present invention is represented by the following formula (A') ##STR2## wherein n is zero or one;
  • t is zero or one
  • R 1 is C 1-5 alkyl, C 3-5 alkenyl, mono- or dihalogenated C 3-5 alkenyl C 3-5 alkynyl or C 1-5 alkoxy-C 1-5 alkyl;
  • one of W and W 1 is CH and the other of W and W 1 is CH or N;
  • W or W 1 when either of W or W 1 is CH, it can be independently substituted by Y or Z;
  • X is hydrogen, C 1-5 alkyl or halogen
  • Y is C 1-5 alkyl, halogen, CF 3 , or di- or trihalogenated C 1-5 alkoxy;
  • Z is hydrogen; C 1-5 alkyl; halogen; CF 3 ; di-, tri or tetrahalogenated C 1-5 -alkoxy; (C 1-5 alkoxy)carbonyl; CN; or NO 2 .
  • a particularly preferred sub-group within the class of the compounds of the present invention of formula A' is one in which n is zero, t is zero, R 1 is methyl or ethyl, each of W and W 1 is CH, X is hydrogen, chloro or fluoro in the 5-position, and Z is in the 2-position and is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
  • Another particularly preferred sub-group of compounds of formula A' is one in which n is zero, t is one, R 1 is methyl or ethyl, each of W and W 1 is CH, X is hydrogen, chloro or fluoro in the 5-position, Y is chloro or fluoro, and Z is in the 2-position and is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
  • the invention also comprises processes of preparing a compound of formula A, comprising:
  • R 1 a is unsubstituted or halogenated C 1-8 alkyl, unsubstituted or halogenated C 2-8 alkenyl, C 2-8 alkynyl, C 2-10 alkoxyalkyl or C 2-10 alkylthioalkyl, and Hal is halogen, or a reactive functional derivative of a compound of formula II; or
  • R 1 a and Hal are as defined above, or a reactive functional derivative of a compound of formula II.
  • the N-oxidation of the 2-pyridylsulfonyl group of a compound of formula I may be carried out according to processes and conditions known in the art of oxidation of pyridine compounds.
  • a suitable oxidizing agent is peracetic acid, for example in the form of the commercially available aqueous 40% solution.
  • a suitable reaction temperature is room temperature or moderately above, e.g. 20° to 50° C.
  • reaction of formulae III & IV may be effected under the conditions known for the preparation of sulfonamides starting from the corresponding sulfonyl halides and amines.
  • the reaction is conveniently carried out in a solvent which is inert under the reaction conditions, such as methylene chloride or benzene.
  • a suitable reaction temperature is room temperature or below, e.g. -10° to 20° C.
  • compound A is preferably as a salt, e.g. the sodium salt (i.e. R 1 is Na).
  • the compounds of formula A may be recovered from the reaction mixture in which they are formed by working up by established procedures.
  • the starting materials are known or, in cases where they are novel, can be produced and purified in accordance with known processes or in a manner analogous to processes described herein or to known processes.
  • novel compounds of formula A are useful as herbicides for the control of weed plants, using pre- and/or postemergent treatments.
  • Herbicide refers to an active ingredient which modifies the growth of plants because of phytotoxic or plant growth regulating properties so as to retard the growth of the plant or to damage the plant sufficiently to kill it.
  • plants it is meant germinating seeds, emerging seedlings and established vegetation including underground portions. While some activity is shown when weeds are treated postemergence, the compounds of the present invention generally are more effective when used as preemergent herbicides.
  • a compound of the present invention is made according to conventional procedure to the weed or its locus using an herbicidally effective amount of the compound, usually from about one-half or less to ten pounds per acre.
  • the application of a compound of the present invention to the "locus" of the weed plant includes application to the seeds, the plant or parts of the plant, or the soil.
  • the compounds of formula A When applied at an appropriate application rate, the compounds of formula A are relatively less toxic toward broadleaf crops, including cotton, soybeans, sugar beets and peanuts, than towards weeds.
  • the compounds of formula A are therefore useful as selective herbicides in a broadleaf crop locus.
  • the amount to be applied to attain the desired effect will vary depending on the particular crop, if employed for selective use, and other standard variables such as the compound employed, mode of application, conditions of treatment and the like.
  • the appropriate application rates can be determined by routine procedures by those skilled in the art, or by comparing the activity of the compounds of the invention with standards for which the application rate is known, e.g. in greenhouse tests.
  • satisfactory results are usually obtained when the compound is applied at a rate in the range of from about 0.03 to 5.0 kg/ha, preferably from about 0.5 to 4 kg/ha, and more particularly from about 1.0 to 3.0 kg/ha, the application being repeated as necessary.
  • the compounds of formula A may be and preferably are employed as herbicidal compositions in association with agriculturally acceptable diluent(s).
  • suitable formulations contain from 0.01% to 99% by weight of active ingredient, from 0 to 20% surfactant and from 1 to 99.99% solid or liquid diluent(s). Higher ratios of surfactant to active ingredient are sometimes desirable and are achieved by incorporation into the formulation or by tank mixing.
  • Application forms of a composition generally contain between 0.01 and 25% by weight of active ingredient. Lower or higher levels of active ingredient can, of course, be present depending on the intended use, the physical properties of the compound and the mode of application.
  • Concentrate forms of a composition intended to be diluted before use generally contain between 2 and 90%, preferably between 10 and 82% by weight of active ingredient.
  • Useful formulations of the compounds of formula A include dusts, granules, suspension concentrates, wettable powders, emulsifiable concentrates, flowables and the like. They are obtained by conventional manner, e.g. by mixing a compound of formula A with the diluent(s) and optionally with other ingredients.
  • the compounds of formula A may be used in micro-encapsulated form.
  • Agriculturally acceptable additives may be employed in the herbicidal compositions to improve the performance of the active ingredient and to reduce foaming, caking and corrosion, for example.
  • surfactant as used herein means an agriculturally acceptable material which imparts emulsifiability, spreading, wetting, dispersibility or other surface-modifying properties.
  • surfactants are sodium lignin sulphonate and lauryl sulphate.
  • Dusts or granules means a liquid or solid agriculturally acceptable material used to dilute a concentrated material to a usable or desirable strength.
  • talc kaolin or diatomaceous earth
  • liquid concentrate forms for example a hydrocarbon such as xylene or an alcohol such as isopropanol, and for liquid application forms i.e. water or diesel oil.
  • compositions of this invention can also comprise other compounds having biological activity, e.g. compounds having similar or complementary herbicidal activity or compounds having antidotal, fungicidal or insecticidal activity.
  • herbicidal compositions will now be described. Parts are percent by weight.
  • VEEGUM® colloidal magnesium aluminium silicate
  • MARASPERSE® C21 purified calcium lignin sulfonate
  • SURFYNOL® TGE acetylenic glycol blend in propylene glycol
  • N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide (1.7 g, 5.3 mmol) is treated with 40% peracetic acid (approx. 12 ml) at 35°-45° under N 2 for 14 hours. The excess peracetic acid is removed under vacuum, and the residue is diluted with methylene chloride, poured into water, neutralized with aq. sodium bicarbonate, washed with brine, dried and evaporated to dryness to give, after purification, the title compound (compound 1, Table A).
  • Example 5 The title compound of Example 5 above is reacted with methyl iodide (0.6 g, 0.26 ml, 4.2 mmol) to give N-methyl-N-(2-chloro-3-pyridyl)-2-pyridinesulfonamide 1-oxide, MS m/e 300.00 (M + +1).
  • Pre-emergent herbicidal activity of compounds of the present invention of Formula A was determined as follows: Seeds of selected weeds were planted and the soil was drenched with a solution of the test compound (11.5 mg) in acetone (5.0 ml) and water (15.0 ml), at a rate equivalent to 10 lb/acre. Scoring was made two weeks after treatment. The grasses (GR) green foxtail, watergrass, shattercane and wild oats and the broadleafs (BL) annual morning glory, mustard, nightshade and velvetleaf were treated. The compounds of Formula A demonstrated herbicidal activity.
  • 2-Pyridinesulfonyl chloride (46.0 mmol) is dissolved in cold methylene chloride and added dropwise at 0° to 2,3-dichloro-N-methylaniline (8.2 g, 46.0 mmol). The mixture is stirred at -10° for approx. 4 hours, then allowed to warm to RT. It is diluted with methylene chloride, washed with aqueous sodium bicarbonate and with brine, dried and evaporated to dryness to give, following purification, N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide.

Abstract

Substituted 2-pyridinesulfonamide 1-oxides, synthesis thereof, intermediates therefor, and the use of said compounds for the control of weeds.

Description

This is a continuation-in-part of Ser. No. 879,658 filed June 27, 1986, now abandoned which is a continuation-in-part of Ser. No. 812,088 filed Dec. 23, 1985 now abandoned.
This invention relates to substituted 2-pyridinesulfonamide 1-oxides, synthesis thereof, intermediates therefor, and the use of the compounds for the control of weeds.
More particularly, the compounds of the present invention are represented by the following formula (A): ##STR1## wherein n is zero or one;
t is zero, one, two, three or four;
R1 is hydrogen, unsubstituted or halogenated C1-8 alkyl, unsubstituted or halogenated C2-8 alkenyl, C2-8 alkynyl, C2-10 alkoxyalkyl or C2-10 alkylthioalkyl;
R2 is hydrogen or C1-8 alkyl;
W is CH or N;
W1 is CH or N; wherein when either of W or W1 is CH, it can be independently substituted by Y or Z;
X is hydrogen, unsubstituted or halogenated C1-8 alkyl, C1-8 alkoxy or halogen;
Y is unsubstituted or halogenated C1-8 alkyl, unsubstituted or halogenated C1-8 alkoxy, C1-8 alkylthio, C2-8 alkoxycarbonyl, nitro, cyano or halogen; and
Z is hydrogen or independently selected from the values of Y.
In practice of the present invention, n is preferably zero or one, more preferably zero.
t is preferably zero, one, two or three; more preferably zero, one or two; most preferably zero or one.
Where any of the substituents R1, R2, X, Y or Z is or comprises halogen, such halogen is conveniently selected from bromo, chloro and fluoro.
Where R1 is unsubstituted or halogenated C1-8 alkyl, such alkyl has preferably 1 to 5, more preferably 1 to 3 C atoms.
Where R1 is unsubstituted or halogenated C2-8 alkenyl, such alkenyl has e.g. 3 to 5, preferably 3 or 4 C-atoms.
Where R1 is alkynyl it comprises e.g. 3 to 5, preferably 3 C-atoms.
Where R1 is halogenated C1-8 alkyl or C2-8 alkenyl, it comprises preferably 1 to 3, e.g. 1 or 2 halogen atoms.
Where R1 is C2-10 alkoxyalkyl, it is preferably C1-5 alkoxy-C1-5 alkyl, e.g. CH2 OCH3.
Where R1 is C2-10 alkylthioalkyl, it is preferably C1-5 alkylthio-C1-5 alkyl.
Where R2 is C1-8 alkyl it has preferably 1 to 5 C-atoms.
Where X is unsubstituted or halogenated C1-8 alkyl, it comprises preferably 1 to 5, e.g. 1 C-atom.
Where X is halogenated C1-8 alkyl it comprises preferably from 1 to 3 halogens. An example of a preferred haloalkyl significance of X is CF3.
Where X is C1-8 alkoxy it has preferably from 1 to 5 C-atoms.
Where any of Y and Z is unsubstituted or halogenated C1-8 alkyl, it comprises preferably from 1 to 5, more preferably 1 or 2 C-atoms.
Where any of Y and Z is halogenated C1-8 alkyl, it comprises preferably from 1 to 3 halogens.
An example of a preferred haloalkyl significance of Y or Z is CF3.
Where any of Y and Z is unsubstituted or halogenated C1-8 alkoxy it comprises preferably from 1 to 5, particularly 1 or 2 carbon atoms.
Where any of Y and Z is halogenated C1-8 alkoxy it comprises preferably from 1 to 4 halogen atoms.
Where any of Y and Z is C1-8 alkylthio, it comprises preferably from 1 to 5 C-atoms.
Where any of Y and Z is halogen, it is preferably F or Cl.
Where any of Y and Z is C2-8 alkoxycarbonyl, it is preferably (C1-5 alkoxy)carbonyl.
R1 is preferably C1-5 alkyl, C2-5 alkenyl or C2-5 alkynyl.
R2 is preferably hydrogen.
X is preferably hydrogen or halogen.
Y is preferably C1-5 alkyl, CF3, nitro or halogen.
Z is preferably C1-5 alkyl, CF3, halogen, or di- or trifluorinated C1-5 alkoxy.
It is preferred that at least one of W and W1 is CH; more preferably W and W1 are both CH.
A preferred sub-group of the present invention is represented by the following formula (A') ##STR2## wherein n is zero or one;
t is zero or one;
R1 is C1-5 alkyl, C3-5 alkenyl, mono- or dihalogenated C3-5 alkenyl C3-5 alkynyl or C1-5 alkoxy-C1-5 alkyl;
one of W and W1 is CH and the other of W and W1 is CH or N;
wherein when either of W or W1 is CH, it can be independently substituted by Y or Z;
X is hydrogen, C1-5 alkyl or halogen;
Y is C1-5 alkyl, halogen, CF3, or di- or trihalogenated C1-5 alkoxy; and
Z is hydrogen; C1-5 alkyl; halogen; CF3 ; di-, tri or tetrahalogenated C1-5 -alkoxy; (C1-5 alkoxy)carbonyl; CN; or NO2.
A particularly preferred sub-group within the class of the compounds of the present invention of formula A' is one in which n is zero, t is zero, R1 is methyl or ethyl, each of W and W1 is CH, X is hydrogen, chloro or fluoro in the 5-position, and Z is in the 2-position and is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
Another particularly preferred sub-group of compounds of formula A' is one in which n is zero, t is one, R1 is methyl or ethyl, each of W and W1 is CH, X is hydrogen, chloro or fluoro in the 5-position, Y is chloro or fluoro, and Z is in the 2-position and is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
The invention also comprises processes of preparing a compound of formula A, comprising:
(a) N-oxidizing the 2-pyridylsulfonyl group of a compound of formula I ##STR3## where X, R1, R2, n, W, W1, Z, Y and t are as defined above, with an oxidizing agent, followed, where desired, by N-alkylating a thus obtained compound of formula A wherein R1 is H with a compound of formula II
Hal--R.sup.1.sub.a                                         (II)
wherein R1 a is unsubstituted or halogenated C1-8 alkyl, unsubstituted or halogenated C2-8 alkenyl, C2-8 alkynyl, C2-10 alkoxyalkyl or C2-10 alkylthioalkyl, and Hal is halogen, or a reactive functional derivative of a compound of formula II; or
(b) N-sulfonating an amine of formula III ##STR4## wherein R1, R2, n, W, W1, Z, Y and t are as defined above, with a compound of formula IV ##STR5## where X is as defined above, and Q is halogen, followed, where desired, by N-alkylating a thus obtained compound of formula A wherein R1 is H with a compound of formula II
Hal--R.sup.1.sub.a                                         (II)
where R1 a and Hal are as defined above, or a reactive functional derivative of a compound of formula II.
The N-oxidation of the 2-pyridylsulfonyl group of a compound of formula I (process a) may be carried out according to processes and conditions known in the art of oxidation of pyridine compounds. A suitable oxidizing agent is peracetic acid, for example in the form of the commercially available aqueous 40% solution. A suitable reaction temperature is room temperature or moderately above, e.g. 20° to 50° C.
The reaction of formulae III & IV (process b) may be effected under the conditions known for the preparation of sulfonamides starting from the corresponding sulfonyl halides and amines. The reaction is conveniently carried out in a solvent which is inert under the reaction conditions, such as methylene chloride or benzene. A suitable reaction temperature is room temperature or below, e.g. -10° to 20° C.
The optional N-alkylation of a compound of formula A where R1 is H may be carried out under processes and conditions known in the art of alkylation of amino compounds. In the process, compound A is preferably as a salt, e.g. the sodium salt (i.e. R1 is Na).
The compounds of formula A may be recovered from the reaction mixture in which they are formed by working up by established procedures.
The starting materials are known or, in cases where they are novel, can be produced and purified in accordance with known processes or in a manner analogous to processes described herein or to known processes.
The novel compounds of formula A are useful as herbicides for the control of weed plants, using pre- and/or postemergent treatments. "Herbicide", as used herein, refers to an active ingredient which modifies the growth of plants because of phytotoxic or plant growth regulating properties so as to retard the growth of the plant or to damage the plant sufficiently to kill it. By "plants" it is meant germinating seeds, emerging seedlings and established vegetation including underground portions. While some activity is shown when weeds are treated postemergence, the compounds of the present invention generally are more effective when used as preemergent herbicides. Application of a compound of the present invention is made according to conventional procedure to the weed or its locus using an herbicidally effective amount of the compound, usually from about one-half or less to ten pounds per acre. The application of a compound of the present invention to the "locus" of the weed plant includes application to the seeds, the plant or parts of the plant, or the soil.
While the compounds of formula A have activity on broadleaf (dicotyledoneous) plants, the compounds in general demonstrate a higher level of herbicidal activity on the grassy (monocotyledoneous) plants and the sedges when applied pre- or postemergence, as shown by greenhouse tests with test dosages equivalent to an application rate of from 0.03 to 10 kg/ha after pre- or postemergence application. Particularly, the compounds of the present invention show relatively greater activity at lower dosage rates when pre-emergent application is utilized.
When applied at an appropriate application rate, the compounds of formula A are relatively less toxic toward broadleaf crops, including cotton, soybeans, sugar beets and peanuts, than towards weeds. The compounds of formula A are therefore useful as selective herbicides in a broadleaf crop locus.
For general herbicidal as well as for selective herbicidal use of compounds of formula A, the amount to be applied to attain the desired effect will vary depending on the particular crop, if employed for selective use, and other standard variables such as the compound employed, mode of application, conditions of treatment and the like. The appropriate application rates can be determined by routine procedures by those skilled in the art, or by comparing the activity of the compounds of the invention with standards for which the application rate is known, e.g. in greenhouse tests. However, in general, satisfactory results are usually obtained when the compound is applied at a rate in the range of from about 0.03 to 5.0 kg/ha, preferably from about 0.5 to 4 kg/ha, and more particularly from about 1.0 to 3.0 kg/ha, the application being repeated as necessary.
The compounds of formula A may be and preferably are employed as herbicidal compositions in association with agriculturally acceptable diluent(s). Suitable formulations contain from 0.01% to 99% by weight of active ingredient, from 0 to 20% surfactant and from 1 to 99.99% solid or liquid diluent(s). Higher ratios of surfactant to active ingredient are sometimes desirable and are achieved by incorporation into the formulation or by tank mixing. Application forms of a composition generally contain between 0.01 and 25% by weight of active ingredient. Lower or higher levels of active ingredient can, of course, be present depending on the intended use, the physical properties of the compound and the mode of application. Concentrate forms of a composition intended to be diluted before use generally contain between 2 and 90%, preferably between 10 and 82% by weight of active ingredient.
Useful formulations of the compounds of formula A include dusts, granules, suspension concentrates, wettable powders, emulsifiable concentrates, flowables and the like. They are obtained by conventional manner, e.g. by mixing a compound of formula A with the diluent(s) and optionally with other ingredients.
Alternatively, the compounds of formula A may be used in micro-encapsulated form.
Agriculturally acceptable additives may be employed in the herbicidal compositions to improve the performance of the active ingredient and to reduce foaming, caking and corrosion, for example.
"Surfactant" as used herein means an agriculturally acceptable material which imparts emulsifiability, spreading, wetting, dispersibility or other surface-modifying properties. Examples of surfactants are sodium lignin sulphonate and lauryl sulphate.
"Diluent" as used herein means a liquid or solid agriculturally acceptable material used to dilute a concentrated material to a usable or desirable strength. For dusts or granules it can be e.g. talc, kaolin or diatomaceous earth, for liquid concentrate forms for example a hydrocarbon such as xylene or an alcohol such as isopropanol, and for liquid application forms i.e. water or diesel oil.
The compositions of this invention can also comprise other compounds having biological activity, e.g. compounds having similar or complementary herbicidal activity or compounds having antidotal, fungicidal or insecticidal activity.
Specific non-limiting Examples of herbicidal compositions will now be described. Parts are percent by weight.
EXAMPLE A: Flowable
0.6 Parts of colloidal magnesium aluminium silicate (VEEGUM®) is dispersed in 41.3 parts of water. 52.0 Parts of a compound of formula A, 6.0 parts of purified calcium lignin sulfonate (MARASPERSE® C21) and 0.1 part of acetylenic glycol blend in propylene glycol (SURFYNOL® TGE) are added, and the mixture is wet-milled until a medium particle size of 3-4 microns is obtained.
EXAMPLE B: Wettable Powder
82.0 Parts of a compound of formula A are mixed and milled with sodium lignin sulfonate (POLYFON® H), 1.0 part of sodium dialkylnaphthalene sulfonate (SELLOGEN® HR) and 13.0 parts of kaolin.
The following examples are provided to illustrate the practice of the present invention. Temperature is given in degrees centigrade. "RT" means room temperature.
FINAL COMPOUNDS EXAMPLE 1 N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide 1-oxide
N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide (1.7 g, 5.3 mmol) is treated with 40% peracetic acid (approx. 12 ml) at 35°-45° under N2 for 14 hours. The excess peracetic acid is removed under vacuum, and the residue is diluted with methylene chloride, poured into water, neutralized with aq. sodium bicarbonate, washed with brine, dried and evaporated to dryness to give, after purification, the title compound (compound 1, Table A).
nmr (CDCl3) τ 6.37 (s, 3H), 2.63 (m, 5H), 2.15 (dd, 1H) and 1.69 ppm (dd, 1H).
EXAMPLE 2
Following the procedure of Example 1, each of the 2-pyridinesulfonamide 1-oxides of formula A" under Table A is prepared.
                                  TABLE A                                 
__________________________________________________________________________
 ##STR6##                                (A")                             
                                    MS    m.p.                            
Cpd X   R.sup.1   n Z       t Y     (M.sup.+  + 1)                        
                                          (°C.)                    
__________________________________________________________________________
1   H   CH.sub.3  0 Cl      1 3-Cl  333.00                                
                                          168                             
2   H   CH.sub.3  0 Cl      1 4-Cl  334.00                                
                                          192                             
3   H   CH.sub.3  0 Cl      0 --    299.00                                
                                          192.5                           
4   H   CH.sub.3  0 F       0 --    282.00                                
                                          161.5                           
5   H   CH.sub.3  0 H       0 --    265.05                                
                                          138                             
6   H   CH.sub.3  0 CH.sub.3                                              
                            1 5-CH.sub.3                                  
                                    293.00                                
                                          133                             
7   H   CH.sub.3  0 H       1 3-CF.sub.3                                  
                                    333.15                                
                                          142                             
8   H   CH.sub.3  1 H       1 4-Cl  313.00                                
                                          117.5                           
9   H   CH.sub.3  1 Cl      0 --    312.60                                
                                          188.5                           
10  H   CH.sub.2 CH.sub.3                                                 
                  1 Cl      0 --    326.60                                
                                          108                             
11  H   CH.sub.2 CH.sub.3                                                 
                  1 H       0 --    292.00                                
                                          89                              
12  H   CH.sub.3  0 CF.sub.3                                              
                            0 --    332.00                                
                                          182                             
13  H   CH.sub.3  0 H       1 4-Cl  299.00                                
                                          84                              
14  H   CH.sub.3  0 H       1 3-Cl  299.00                                
                                          148.5                           
15  H   CH.sub.3  0 Cl      1 5-Cl  333.00                                
                                          183.5                           
16  H   CH.sub.3  0 H       2 3,4-diCl                                    
                                    334.90                                
                                          113                             
17  H   CH.sub.3  0 H       2 3,5-diCl                                    
                                    334.00                                
                                          164                             
18  H   CH.sub.3  0 Cl      2 3,4-diCl                                    
                                    368.95                                
                                          183                             
19  H   CH.sub.3  0 Cl      2 4,6-diCl                                    
                                    368.95                                
                                          193                             
20  H   CH.sub.3  0 CH.sub.3                                              
                            0 --    279.05                                
                                          194                             
21  H   CH.sub.3  0 CH.sub.3                                              
                            1 6-CH.sub.3                                  
                                    293.15                                
                                          187                             
22  H   CH.sub.3  0 CH.sub.3                                              
                            1 6-Cl  313.05                                
                                          176                             
23  H   CH.sub.3  0 CH.sub.3                                              
                            1 5-Cl  313.05                                
                                          169                             
24  H   CH.sub.3  0 CH.sub.3                                              
                            1 5-F   313.05                                
                                          205                             
25  H   CH.sub.3  0 Cl      1 5-CH.sub.3                                  
                                    297.15                                
                                          175                             
26  H   CH.sub.3  0 Cl      1 5-NO.sub.2                                  
                                    344.95                                
                                          171                             
27  H   CH.sub.3  0 Cl      1 5-CF.sub.3                                  
                                    367.90                                
                                          156                             
28  H   CH.sub.3  0 CF.sub.3                                              
                            1 4-Cl  367.00                                
                                          153.5                           
29  H   CH.sub.3  0 OCHF.sub.2                                            
                            0 --    331.00                                
                                          116                             
30  H   CH.sub.3  0 OCHF.sub.2                                            
                            1 5-CH.sub.3                                  
                                    345.15                                
                                          108                             
31  H   CH.sub.3  0 OCHF.sub.2                                            
                            1 5-Cl  364.70                                
                                          95                              
32  H   CH.sub.3  0 OCHF.sub.2                                            
                            1 3-Cl  364.70                                
                                          137.5                           
33  H   CH.sub.3  1 H       0 --                                          
34  H   CH.sub.2 CH.sub.3                                                 
                  0 Cl      1 5-Cl  348.00                                
                                          161                             
35  H   CH.sub.2 CH.sub.3                                                 
                  0 CF.sub.3                                              
                            0 --    347.95                                
                                          186.5                           
36  H   CH.sub.2 OCH.sub.3                                                
                  0 CF.sub.3                                              
                            0 --    363.00                                
                                          127.5                           
37  H   CH.sub.2 CHCH.sub.2                                               
                  0 CF.sub.3                                              
                            0 --    359.20                                
                                          151.5                           
38  H   CH.sub.2 C(Cl)CH.sub.2                                            
                  0 CF.sub.3                                              
                            0 --    393.05                                
                                          148                             
39  H   CH.sub.2 CCH                                                      
                  0 CF.sub.3                                              
                            0 --    357.00                                
                                          168                             
40  H   CH.sub.2 C(CH.sub.3)CH.sub.2                                      
                  0 CF.sub.3                                              
                            0 --    373.20                                
                                          161                             
41  H   CH.sub.2 CHCF.sub.2                                               
                  0 CF.sub.3                                              
                            0 --    394.00                                
                                          99                              
42  5-Cl                                                                  
        CH.sub.3  0 NO.sub.2                                              
                            0 --    344.00                                
                                          166                             
43  5-Cl                                                                  
        CH.sub.3  0 CN      0 --    324.00                                
                                          201.5                           
44  H   CH.sub.3  0 CN      0 --    290.00                                
                                          176                             
45  5-Cl                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --    366.70                                
                                          167                             
46  5-Cl                                                                  
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-CH.sub.3                                  
                                    378.70                                
                                          123                             
47  5-Cl                                                                  
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-Cl  399.00                                
                                          180.5                           
48  5-Cl                                                                  
        CH.sub.3  0 OCHF.sub.2                                            
                            0 --    364.70                                
                                          132                             
49  5-CF.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            0 --    398.00                                
                                          104.5                           
50  5-CF.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-CH.sub.3                                  
51  5-CF.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-Cl                                        
52  5-CF.sub.3                                                            
        CH.sub.3  0 CF.sub.3                                              
                            0 --    400.00                                
                                          165                             
53  4-CH.sub.3                                                            
        CH.sub.3  0 Cl      1 3-Cl  348.95                                
                                          175                             
54  4-CH.sub.3                                                            
        CH.sub.3  0 Cl      1 5-Cl  347.00                                
                                          204.5                           
55  5-CH.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            0 --    345.00                                
                                          148.5                           
56  4-CH.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-Cl                                        
57  4-CH.sub.3                                                            
        CH.sub.3  0 CF.sub.3                                              
                            0 --    347.05                                
                                          201.5                           
58  3-CH.sub.3                                                            
        CH.sub.3  0 Cl      1 5-Cl  348.00                                
                                          190                             
59  3-CH.sub.3                                                            
        CH.sub.3  0 OCHF.sub.2                                            
                            0 --                                          
60  3-CH.sub. 3                                                           
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-Cl                                        
61  3-CH.sub.3                                                            
        CH.sub.3  0 CF.sub.3                                              
                            0 --    347.05                                
                                          188.5                           
62  5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 CF.sub.3                                              
                            0 --    380.70                                
                                          187                             
63  5-Cl                                                                  
        CH.sub.2 CHCH.sub.2                                               
                  0 CF.sub.3                                              
                            0 --    392.70                                
                                          177.5                           
64  5-Cl                                                                  
        CH.sub.3  0 OCHF.sub.2                                            
                            1 3-Cl  399.00                                
                                          163                             
65  5-Cl                                                                  
        CH.sub.3  0 Cl      1 3-Cl  367.80                                
                                          180                             
66  3-Cl                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --    366.70                                
                                          210                             
67  4-Cl                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --    367.00                                
                                          171                             
68  6-Cl                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --    367.00                                
                                          159                             
69  4-Br                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --                                          
70  5-Br                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --    413.00                                
                                          187.5                           
71  6-Br                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            0 --                                          
72  4-F CH.sub.3  0 CF.sub.3                                              
                            0 --                                          
73  5-F CH.sub.3  0 CF.sub.3                                              
                            0 --                                          
74  6-F CH.sub.3  0 CF.sub.3                                              
                            0 --                                          
75  5-CH.sub.3                                                            
        CH.sub.3  0 CF.sub.3                                              
                            0 --    347.00                                
                                          176                             
76  6-CH.sub.3                                                            
        CH.sub.3  0 CF.sub.3                                              
                            0 --    347.00                                
                                          166.5                           
77  H   CH.sub.3  0 NO.sub. 2                                             
                            0 --    309.00                                
                                          236                             
78  H   CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            0 --    363.00                                
                                          87                              
79  H   CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            1 5-CH.sub.3                                  
                                    377.00                                
                                          108                             
80  H   CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            1 5-Cl  397.00                                
                                          148                             
81  5-Cl                                                                  
        CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            0 --    397.00                                
                                          149                             
82  5-Cl                                                                  
        CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            1 5-CH.sub.3                                  
                                    419.00                                
                                          111                             
83  5-Cl                                                                  
        CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            1 5-Cl  431.00                                
                                          164                             
84  5-Cl                                                                  
        CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            1 5-CF.sub.3                                  
                                    365.00                                
                                          136                             
85  5-Cl                                                                  
        CH.sub.3  0 Cl      1 5-Cl  367.00                                
                                          179.5                           
86  5-Cl                                                                  
        CH.sub.3  0 CF.sub.3                                              
                            1 5-Cl                                        
87  5-Cl                                                                  
        CH.sub.3  0 Cl      1 5-CH.sub.3                                  
                                    348.00                                
                                          168.5                           
88  5-Cl                                                                  
        CH.sub.3  0 CH.sub.3                                              
                            1 3-Cl  348.00                                
                                          150                             
89  5-Cl                                                                  
        CH.sub.3  0 CH.sub.3                                              
                            1 5-Cl  348.00                                
                                          154.5                           
90  5-Cl                                                                  
        CH.sub.3  0 CH.sub.3                                              
                            0 --    313.00                                
                                          175                             
91  5-Cl                                                                  
        CH.sub.3  0 CH.sub.2 CH.sub.3                                     
                            0 --    327.00                                
                                          167                             
92  5-Cl                                                                  
        CH.sub.3  0 CH.sub.2 CH.sub.3                                     
                            1 6-CH.sub.2 CH.sub.3                         
                                    355.00                                
                                          119                             
93  5-Cl                                                                  
        CH.sub.3  0 CH(CH.sub.3).sub.2                                    
                            0 --    341.00                                
                                          155                             
94  5-Cl                                                                  
        CH.sub.3  0 H       1 3-OCHF.sub.2                                
                                    365.00                                
                                          80                              
95  5-Cl                                                                  
        CH.sub.3  0 OCHF.sub.2                                            
                            1 5-F   383.00                                
                                          145                             
96  5-Cl                                                                  
        CH.sub.3  0 OCF.sub.2 CHF.sub.2                                   
                            0 --    415.00                                
                                          170                             
97  5-Cl                                                                  
        CH.sub.3  0 OCF.sub.2 CHClF                                       
                            0 --    432.00                                
                                          152.5                           
98  5-Cl                                                                  
        CH.sub.3  0 Cl      1 5-CF.sub.3                                  
                                    402.00                                
                                          134                             
99  5-Cl                                                                  
        CH.sub.3  0 F       1 6-F   335.00                                
                                          171                             
100 5-Cl                                                                  
        CH.sub.3  0 F       1 3-F   335.00                                
                                          163                             
101 5-Cl                                                                  
        CH.sub.3  0 F       1 5-F   335.00                                
                                          152                             
102 5-Cl                                                                  
        CH.sub.3  0 F       1 5-CF.sub.3                                  
                                    385.00                                
                                          106.5                           
103 5-Cl                                                                  
        CH.sub.3  0 F       1 6-Cl  351.00                                
                                          189                             
104 5-Cl                                                                  
        CH.sub.3  0 CN      1 3-Cl  359.00                                
                                          225                             
105 5-Cl                                                                  
        CH.sub.3  0 H       1 3-Cl  334.00                                
                                          119                             
106 5-Cl                                                                  
        CH.sub.3  0 H       1 4-CH.sub.3                                  
                                    313.00                                
                                          144.5                           
107 5-Cl                                                                  
        CH.sub.3  0 C(O)OCH.sub.3                                         
                            0 --    357.00                                
                                          175                             
108 5-Cl                                                                  
        CH.sub.3  0 C(O)OCH.sub.3                                         
                            1 5-Cl  391.00                                
                                          146                             
109 H   CH.sub.3  0 Cl      1 6-F   317.00                                
                                          197                             
110 H   CH.sub.3  0 F       1 6-F   301.00                                
                                          157                             
111 H   CH.sub.3  0 C(O)OCH.sub. 2 CH.sub.3                               
                            0 --    337.00                                
                                          124.5                           
112 H   CH.sub.3  0 C(O)OCH.sub.3                                         
                            1 5-Cl  357.00                                
                                          148.5                           
113 H   CH(CH.sub.3).sub.2                                                
                  0 CF.sub.3                                              
                            0 --    361.00                                
                                          221                             
114 H   CH.sub.2 CH.sub.2 CH.sub.3                                        
                  0 CF.sub.3                                              
                            0 --    361.00                                
                                          175                             
115 H   CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3                               
                  0 CF.sub.3                                              
                            0 --    375.00                                
                                          139                             
116 5-Cl                                                                  
        CH.sub.2 CH.sub.2 CH.sub.3                                        
                  0 CF.sub.3                                              
                            0 --    395.00                                
                                          164.5                           
117 5-Cl                                                                  
        CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3                               
                  0 CF.sub.3                                              
                            0 --    409.00                                
                                          177                             
118 5-Cl                                                                  
        CH.sub.3  0 CH.sub.2 CH.sub.3                                     
                            1 5-Cl  362.00                                
                                          190                             
119 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 OCH.sub.2 CF.sub.3                                    
                            0 --    411.00                                
                                          131                             
120 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 F       1 6-F   349.00                                
                                          143.5                           
121 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 F       1 6-Cl  365.00                                
                                          162                             
122 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 OCHF.sub.2                                            
                            0 --    379.00                                
                                          149                             
123 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 OCHF.sub.2                                            
                            1 3-Cl  414.00                                
                                          202                             
124 5-Cl                                                                  
        CH.sub.2 CH.sub.3                                                 
                  0 OCHF.sub.2                                            
                            1 5-F   397.00                                
                                          130                             
125 5-Cl                                                                  
        CH.sub.2 CH.sub.2 CH.sub.3                                        
                  0 F       1 6-F   363.00                                
                                          120                             
126 5-Cl                                                                  
        CH.sub.2 CH.sub.2 CH.sub.3                                        
                  0 F       1 6-Cl  379.00                                
                                          151.5                           
127 5-Cl                                                                  
        CH.sub.2 CH.sub.2 CH.sub.3                                        
                  0 OCHF.sub.2                                            
                            0 --    393.00                                
                                          118                             
128 5-Cl                                                                  
        CH.sub.3  0 F       3 3,5,6-triF                                  
                                    371.00                                
                                          146.5                           
129 H   H         0 CF.sub.3                                              
                            0 --                                          
130 5-Cl                                                                  
        CH.sub.3  0 Br      1 6-Cl  413.00                                
                                          212                             
131 5-Cl                                                                  
        CH.sub.3  0 Br      1 6-F   396.00                                
                                          183                             
132 5-Cl                                                                  
        CH.sub.3  0 Cl      1 5-CH.sub.2 CH.sub.3                         
                                    362.00                                
                                          140                             
133 5-Cl                                                                  
        CH.sub.3  0 Br      0 --    378.00                                
                                          184                             
134 5-Cl                                                                  
        CH.sub.3  0 CH.sub.3                                              
                            1 3-NO.sub.2                                  
                                    358.00                                
                                          156                             
135 5-Cl                                                                  
        CH.sub.3  0 NO.sub.2                                              
                            1 6CH.sub.3                                   
                                    358.00                                
                                          167                             
136 5-F CH.sub.3  0 OCHF.sub.2                                            
                            0 --                                          
137 5-F CH.sub.3  0 OCH.sub.2 CF.sub.3                                    
                            0 --                                          
138 5-F CH.sub.3  0 F       1 6-F                                         
139 5-F CH.sub.3  0 F       1 6-Cl                                        
__________________________________________________________________________
EXAMPLE 3 N-allyl-N-(2-trifluoromethylphenyl)-2-pyridinesulfonamide 1-oxide
To N-(2-trifluoromethylphenyl)-2-pyridinesulfonamide 1-oxide (compound 129, Table A) (1.0 g, 3.0 mmol) in 10 ml of DMF is added NaH (0.30 g, 6.2 mmol) under N2, and the mixture is stirred at RT for 30 minutes. Allyl bromide (0.82 g, 0.59 ml, 6.8 mmol) is added dropwise, and the mixture is stirred at RT for 48 hours. It is then worked up and purified to give the title compound (compound 37, Table A). (DMF is dimethylformamide; RT is room temperature.)
nmr (CDCl3) 5.67-3.95 (m, 5H), 2.54 (m, 6H), 2.14 (dd, 1H, 8 Hz) and 1.64 ppm (dd, 1H, 8 Hz).
EXAMPLE 4 N-methyl-N-(3,5-dichloro-2-pyridyl)-2-pyridinesulfonamide 1-oxide
Following the procedures of Example 1, N-methyl-N-(3,5-dichloro-2-pyridyl)-2-pyridinesulfonamide is oxidized with 40% peracetic acid to give the title compound, MS m/e 334.00 (M+).
EXAMPLE 5 N-(2-chloro-3-pyridyl)-2-pyridinesulfonamide 1-oxide
Following the procedure of Example 1, 3-amino-2-chloropyridine (3.0 g, 24.0 mmol) is reacted with 2-pyridinesulfonyl chloride 1-oxide (24.0 mmol) to give the title compound.
EXAMPLE 6 N-methyl-N-(2-chloro-3-pyridyl)-2-pyridinesulfonamide 1-oxide
The title compound of Example 5 above is reacted with methyl iodide (0.6 g, 0.26 ml, 4.2 mmol) to give N-methyl-N-(2-chloro-3-pyridyl)-2-pyridinesulfonamide 1-oxide, MS m/e 300.00 (M+ +1).
BIOLOGICAL ACTIVITY EXAMPLE 7
Pre-emergent herbicidal activity of compounds of the present invention of Formula A was determined as follows: Seeds of selected weeds were planted and the soil was drenched with a solution of the test compound (11.5 mg) in acetone (5.0 ml) and water (15.0 ml), at a rate equivalent to 10 lb/acre. Scoring was made two weeks after treatment. The grasses (GR) green foxtail, watergrass, shattercane and wild oats and the broadleafs (BL) annual morning glory, mustard, nightshade and velvetleaf were treated. The compounds of Formula A demonstrated herbicidal activity.
INTERMEDIATE COMpOUNDS EXAMPLE 8 N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide
2-Pyridinesulfonyl chloride (46.0 mmol) is dissolved in cold methylene chloride and added dropwise at 0° to 2,3-dichloro-N-methylaniline (8.2 g, 46.0 mmol). The mixture is stirred at -10° for approx. 4 hours, then allowed to warm to RT. It is diluted with methylene chloride, washed with aqueous sodium bicarbonate and with brine, dried and evaporated to dryness to give, following purification, N-methyl-N-(2,3-dichlorophenyl)-2-pyridinesulfonamide.

Claims (19)

What is claimed is:
1. A compound of the following formula (A): ##STR7## wherein, n is zero or one;
t is zero, one, two, three or four;
R1 is hydrogen, unsubstituted or halogenated C1-8 alkyl, unsubstituted or halogenated C2-8 alkenyl, C2-8 alkynyl, C2-10 alkoxyalkyl or C2-10 alkylthioalkyl;
R2 is hydrogen or C1-8 alkyl;
X is hydrogen, unsubstituted or halogenated C1-8 alkyl, C1-8 alkoxy, or halogen; and
each of Y and Z is independently unsubstituted or halogenated C1-8 alkyl, unsubstituted or halogenated C1-8 alkoxy, C1-8 alkylthio, C2-8 alkoxycarbonyl, nitro, cyano or halogen.
2. A compound of the following formula, according to claim 1: ##STR8##
3. A compound according to claim 2 wherein n is zero; t is zero or one; R1 is C1-4 alkyl, C2-4 alkenyl or C2-4 alkynyl; and X is hydrogen, methyl, chloro or fluoro.
4. A compound according to claim 3 wherein Y is methyl, chloro, fluoro, trifluoromethyl or nitro; and Z is methyl, chloro, fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
5. A compound according to claim 4 wherein t is zero and R1 is methyl, ethyl, n-propyl, allyl or propargyl.
6. A compound according to claim 5 wherein Z is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
7. A compound according to claim 6 wherein X is hydrogen, chloro or fluoro and is in the 3, 4 or 5 position.
8. The compound N-methyl-N-(2-trifluoromethylphenyl)-2-pyridinesulfonamide 1-oxide, according to claim 7.
9. The compound N-methyl-N-(2-trifluoromethylphenyl)-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 7.
10. The compound N-ethyl-N-(2-trifluoromethylphenyl)-2-pyridinesulfonamide 1-oxide, according to claim 7.
11. The compound N-ethyl-N-(2-trifluoromethylphenyl)-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 7.
12. The compound N-ethyl-N-(2-difluoromethoxyphenyl)-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 7.
13. The compound N-methyl-N-[2-(2,2,2-trifluoroethoxy)phenyl]-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 7.
14. A compound according to claim 4 wherein t is one and R1 is methyl, ethyl, n-propyl, allyl or propargyl.
15. A compound according to claim 14 wherein X is hydrogen, chloro or fluoro and is in the 3, 4 or 5 position; and Y is chloro or fluoro and is in the 3, 5 or 6 position.
16. A compound according to claim 15 wherein Z is fluoro, trifluoromethyl, difluoromethoxy or 2,2,2-trifluoroethoxy.
17. The compound N-methyl-N-(2,5-difluorophenyl)-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 16.
18. The compound N-ethyl-N-(2,6-difluorophenyl)-5-chloro-2-pyridinesulfonamide 1-oxide, according to claim 16.
19. A method of combatting weeds which comprises applying to the weeds or the locus thereof a herbicidally effective amount of a compound of formula (A) as defined in claim 1.
US06/938,681 1986-06-27 1986-12-05 Pyridinesulfonamides and their use as herbicidal agents Expired - Fee Related US4722749A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879249A (en) * 1983-02-25 1989-11-07 Baldwin Thomas O Linker compounds, linker-compound-ligands and linker-compound-receptors
US4881969A (en) * 1988-02-18 1989-11-21 Basf Aktiengesellschaft Sulfonamides
US4999044A (en) * 1988-02-18 1991-03-12 Basf Aktiengesellschaft Heterocyclic sulfonamides
US6093681A (en) * 1996-10-25 2000-07-25 Monsanto Company Composition and method for treating plants with exogenous chemicals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879249A (en) * 1983-02-25 1989-11-07 Baldwin Thomas O Linker compounds, linker-compound-ligands and linker-compound-receptors
US4881969A (en) * 1988-02-18 1989-11-21 Basf Aktiengesellschaft Sulfonamides
US4999044A (en) * 1988-02-18 1991-03-12 Basf Aktiengesellschaft Heterocyclic sulfonamides
US6093681A (en) * 1996-10-25 2000-07-25 Monsanto Company Composition and method for treating plants with exogenous chemicals
US6475953B1 (en) 1996-10-25 2002-11-05 Monsanto Technology Llc Composition and method for treating plants with exogenous chemicals

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